Electric signal-circuit



(No Model.)

0 W. HART.

ELECTRIC SIGNAL GIRGUIIT. No. 428,095. I Patented May 20, 1890.

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A B hgsomfl I ENE :04, moYcruTMo WASHINGTON o c UNITED STATES PATENT OFFICE.

ORLANDO W. HART, OF FALL RIVER, MASSACHUSETTS.

ELECTRIC SIGNAL-CIRCUIT.

SPECIFICATION forming part of Letters Patent No. 428,095, dated May 20, 1890.

Application filed August 23, 1889. Serial No. 321,771. (No model.)

To all whom it may concern.-

Be it known that I, ORLANDO W. HART, of Fall River, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Electric Signal- Circuits, of which the followingis a specification.

The object of this invention is to so construct a signal-circuit of the character mentioned as to make it impossible to send a signal through the main magnet save by operating one of the stations, as hereinafter described.

The accompanying drawing shows a diagrammatic View of a signal-circuit embodying my invention.

A represents the battery.

B 13 13 are stations.

(1 O O are the top contacts.

D D D" are the straps or levers.

E E E are the lower contacts.

F is the lower contact-Wire to the battery.

H is the main signal-magnet.

J J are the wires leading from the top contact to the next strap above.

K is the wire leading from the last top contact to the trouble-magnet I.

L is the wire leading from the trouble-magnet to the battery.

N is the wire leading from the main magnet to the battery.

P is the wire leading from the strap of the first key to the main signal-magnet.

To make or transmit a signal from any stationsay station E, for eXample-a button is pressed, so as to make bottom contact at E with the strap D, thus opening the circuit leading through the trouble-magnet I, and sending the battery-circuit through the main signal-magnet II, giving the necessary signal, said circuit then consisting of Wires F N P and strap D. In case of trouble arising from short-circuits and like causes the current will flow around the short-circuit; but as the resistance of the main magnet H is not less than five times greater than the resistance of the trouble-magnet I, only one-fifth of the current will flow through magnet II, which is insufficient to operate it and give the signal, while the remaining four-fifths will pass through the various stations B B B" and Wire K to the trouble-magnet I, and through Wire L to the battery, giving the alarm at the trouble-magnet, and communicating thus the fact that there is trouble on the line. It Will thus be seen that closing the circuit anywhere, excepting atstations, alarms the magnet I.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

In an electric signal-circuit, the combination of the main circuit consisting, essentially, of the wires N P F, straps D D D, contacts E E E", and signal-magnet II, and the shuntcircuit described, consisting, essentially, of the wire L, connecting with the main circuit between the battery and the main signal-magnet, the trouble-magnet I, and wire K, connecting with the main circuit at the top contact of the last station on the line, the resistance of the main magnetbeing much greater than the resistance of the trouble-magnet, substantially as set forth.

ORLANDO \V. HART.

WVitnesses HENRY W. WILLIAMS, B. W. WILLIAMS. 

